103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* $NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $ */
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/*
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* Copyright (c) 1988 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char *sccsid = "@(#)strtok.c 5.8 (Berkeley) 2/24/91";
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#else
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__RCSID("$NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <string.h>
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#ifdef __weak_alias
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__weak_alias(strtok_r,_strtok_r)
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#endif
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char *
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strtok_r(s, delim, lasts)
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char *s;
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const char *delim;
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char **lasts;
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{
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const char *spanp;
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int c, sc;
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char *tok;
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/* s may be NULL */
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_DIAGASSERT(delim != NULL);
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_DIAGASSERT(lasts != NULL);
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if (s == NULL && (s = *lasts) == NULL)
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return (NULL);
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/*
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* Skip (span) leading delimiters (s += strspn(s, delim), sort of).
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*/
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cont:
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c = *s++;
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for (spanp = delim; (sc = *spanp++) != 0;) {
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if (c == sc)
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goto cont;
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}
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if (c == 0) { /* no non-delimiter characters */
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*lasts = NULL;
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return (NULL);
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}
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tok = s - 1;
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/*
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* Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
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* Note that delim must have one NUL; we stop if we see that, too.
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*/
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for (;;) {
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c = *s++;
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spanp = delim;
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do {
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if ((sc = *spanp++) == c) {
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if (c == 0)
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s = NULL;
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else
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s[-1] = 0;
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*lasts = s;
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return (tok);
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}
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} while (sc != 0);
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}
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/* NOTREACHED */
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}
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